Reinforced concrete construction.



D. w. MoRRow. REINFORGED CONCRETE CONSTRUCTION.

APPLIOATION FILED MAY 18, 1912. I

Patented June 17, 1913.

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wrm/8858.- j W gw A TTOHNEYS D. W. MoRnow. REINIORGED CONCRETE CONSTRUCTION,

APPLICATION FILED MAY 13, 1912.

1,064,850, Patented June 17.1913.

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Arron/VHS Unrrnn sTATEs "PATENT OFFICE.)

DAVIDYW. MoRRoW, orfcLEVELAND, oHIo, Assmaxoa or oNE-HALr To JAMES P.

Y CROSS, or CLEVELAND, OHIO.

REINFORCED CONCRETE CONSTRUCTION.

` Patented June 17, 1913.

Application filed May 18, 1912. Serial No. 698.096.

To all whom@ may conce/rn Be itknown that I, Day-'1D XV. Momzow, a .igen oftne United. States, residing at Cleveland,.in the county of Cuyahoga and State of Ohio, havel invented a certainnew and useful Improvement in Reinforced Concrete Construction, of which the fcllowincr is a full, clear, and exact description. l This invention relates to a .reinforced monolithic concrete vflat floor slab. and column construction of the type wherein slab reinforcing elements extend between adjacent. columns and are supported prior to the casting of the floor concrete upon a form or support which is placed above the colunm and is adapted to be embedded, with the slab reinforcement, in the slab.

One of the-objects of the invention is to provide an arrangement of reinforcement for the slab which. obtains maximum strength fromA the reinforced concrete, while lend that the material may be vdistributed 'in the slab to' give a uniform reinl'orcementl more nearly proportional'to the stresses occurring` in the slab than is accomplished with constructions at present in use.

YA further object is to provide an efficient form of support for the slab reinforcement .above the column.

Reference shouldbe had to the accompanying drawings forming a part of' this specification, in which` Figure 1 is a plan View of a slab reinforcement. Fig. 2 is a top plan view showing the support or form' for the slab reinforcement above a column; Fig. 3) is an .ele-

-vation of a portion of. a column and slab showing the column reinforcement and the support. or form for the slab reinforcement;`

and Fig. l isv a sectionon the line 4 1 of Fig. 3.

Fig. i shows a plurality of columns A arranged in rows. and in accordance with my invention the columns in adjacent rows are staggered with respect to each other. These columns areplaced so that each column is substantially equidistant from .its adjacent columns. and considering a group of any three adjacent columns, they form in effect the corners of an equilateral triangle, or of a triangle: which is substantially eouilateral talnngino account 'llltly deviation in location of columns from their intended exact locations. However, the columns are placed as near equidistant asv is possible in practice. Reinforcing bars larranged in `fi-oups indicated at G, H and I, extend between adjacent columns, and the reinforci'ingl bars in each group are arrangedl so that they lie in the upper portion of the slab at points above the columns, and are adjacent to the lower face of the slab at points midway between the columns.

Due to the fact that the columns about any one column are arranged equidistant therefrom. the stresses in'the slab about a column head are uniform in all directions from the axis of thecolumn. Such beiner the case there is much less likelihood of crackingand failure of slabs than would be the case .if the stresses were unequal.

The arrangement of reinforcing elements shown in this figure of the drawing and linst described, produces a slab having the required streng'th and at the same time requires considerably less reinforcing material than is at present required by other forms of slab reinforcement now in use.

In the event that the columns being. arranged as shown in Fig'. l are placed a considerable distance apart, it may be necessary to use some additional reinforcing material at points between the coluinns. But even under such conditions the amount of rein` `\\'hcrein the columns about. any one colulun are uneinially spaced therefrom.

rlfhe form of reinforcement for the column may be -varied. I have shown av group of vertical rods J which are bound together by a spiral reinforcement K. The column reinforcing' element may be extended past the slab, that is to sayl they may be extended from the top to the bottom of the buildin?, but the portion betwcenadjacent slabs or floors when concreted are formed with a flaring head whichbecomes integral with the slab. l

ln order that the reinforcing members for the. slab may be supported and correctly positioned in the slab and moreparticularly those portions thereof above the column, I have arranged a support orvform to be used for the purpose of supporting and securing the correct )ositioning of the bars before they are emiedded in the concrete.

As is well known, it is customary to use decking to support. 'the concrete beforev it sets. Upon the. decking thus used .l place a. plurality of bracketsor standards Mv is supported by these brackets. It. will be clear that other bars, in addition to those showininay be used, where such is desired,

The objectsought vby the support or snpports, as the case may be, is merely to support and correctly position theslab rein-,- forcing barsyso that they-may occupy the correct position in the slab when it is cast. The brackets M and() may be cast or may be stamping material, and when these are en'iployed to support thc bars N and 1"' the positioning of the slab reinforcement may be very correctly made, much more so than if the bars are bent by the workmen inthe layingl of the same.

then the slab reinforcing elements have been made the slab is thenpoi'ired which embeds the. reinforcingelements and supportv for the same above the column.

Haring thus described'my invention, I olaiin:---- i 1. In a monolithic concrete. construction, thel combination with-a reinforced flat slab and a plurality of reinforced columns, the said columns being arranged in rows and the colf, unins of adjacent rows beingstaggered withrespect to leach other, any group-of three` adjacent columns' in two .-adjacei'it rows foi-ming the. apices'j-of a substantially equilateral triangle, said slab lia-vin'g'groups of reinforcing rods }'iassing oifer tlie columns-in the directions of tlie'three' Asides ofthe triangle,

In a monolithic c oi'icrete construction, a floor slab, a pluralityof reinforcedcolumns` arranged inrows, the columns in adjacent rows beingstaggered with respectto fat-h other. any tour adirupent columns which form the apices of a parallelogram being substantially equidistant apart in the directions of thc-four sides and short diagonal of theparallelogram, :and groups of reinforcing rods extending over vthe columns in the directions ofthe four sides and of the short of the parallelograin, and groups of rein@ forcing rods extendii'ig'over tlie columns in the directions of the four sides and of the short diagonal. the said rods being near the lower face of thc slab midway between the columns, and near the upper face of the slab over the columns.

t. In a monolithic concrete construction, n iooi slab, a plurality of reinforced columns arranged in rows, the columns in adjacent rows beingstaggered with respect to each otlie and any four Iadjacent columns of which. form the apices of a. lnirallelogram being substantially equidistantapart in the directions of the four sides and short diagonalof the .parallelograim and groups of rc inforcing rods extending over the columns 1in the direction of the four sides and lshort 'nal of the parallelograni, and belts of reinforcing rods extending over the columns nr the directions of the four sides and short. diagon'aL the said belts being of but one thickness of reinforcement midway between theA lcolumns and'tlirec thicknesses of rcinfoicement over` the columns.

Iii-testimony whereof, I hereunto atlix my signature in the presence of two witnesses.

' DAVlD W. MORROW.

Witnesses A'. F. Kwis, A. J. llonson. 

